View source for Auxiliary chamber

[[File:Fig 04.gif|thumb|<font size="2">'''Fig. 1.''' Embryonic and periembryonic chambers in ''Orbitoides spp.'' according to Van Hinte's 1966 concept.
'''I:''' protoconch; '''II:''' deuteroconch; '''PAC:''' principal auxiliary chamber; '''PEC:''' principal epi-auxiliary chamber; '''AEC:''' accessory epi-auxiliary chamber. In our view, we prefer to call PAC an auxiliary and AEC an adauxiliary chamber; (Hottinger, 2006; fig. 4 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]

[[File:Fig. 36a.png|thumb|<font size="2">'''Fig. 2.'''  Development of chamberlet cycles from an auxiliary chamber in an early orbitoid, the Campanian ''Lepidorbitoides minima'' H. Douvillé from Mexico, after Aguilar et alii, 2002.
'''A:''' stereograph of a megalospheric embryo consisting of a biconch (protoconch and deuteroconch) supplemented by a third chamber (auxiliary chamber) with a median and two lateral stolons. Successive growth stages coloured alternately in red and blue. Lamellation omitted. Schematic, not to scale. 
'''A:''' auxiliary chamber; '''D:''' [[deuteroconch]]; '''P:''' [[protoconch]];  ; '''lst:''' lateral stolon; '''mst:''' median stolon;  (Hottinger, 2006; fig. 36a [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
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==Definition==
*''according to Hottinger (2006):''
'''AUXILIARY CHAMBER''' -  (= auxiliary chamberlet); a chamber or a chamberlet fed by a stolon positioned in the suture between [[protoconch]] and [[deuteroconch]] in orbitoidiform foraminifers. May be double in embryos with a bilateral symmetry or multiple, when the protoconch and the deuteroconch have additional equatorial stolons. Together with the adauxiliary chamberlets, they form a [[corona]].








==See also:==
* [[corona]]
* [[protoconch]]
* [[deuteroconch]]

==References==
Aguilar, Bernaus, Caus & Hottinger (2002), Lepidorbitoides minima DOUVILLÉ from Mexico, a foraminiferal index fossil for the Campanian, Journal of foraminiferal Research, Lawrence, vol. 32, N° 2, p. 126–134.

Van Hinte (1966), Orbitoides from the Campanian type section. Part I., Koninklijke Nederlandse Akademie van Wetenschappen, Proceedings, Amsterdam, (Series B), vol. 69, N° 1, p. 79-110.

Hottinger (2006), [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Illustrated glossary of terms used in foraminiferal research]. [http://paleopolis.rediris.es/cg/uk-index.html Carnets de Géologie], [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Memoir 2], ISSN 1634-0744                                                              
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